[DML] Re: Broken Bolt advice

["content22207" <brobertson@xxxxxxxxxxxx>]

Can't figure out from your description which bolt it is, but:

Do you have Dremel's carbide cutter for your Moto Tool? Costs $8 but
is worth every penny. Very sharp and very hard. Cuts sideways -- if
you have 1/8" clearance around the broken bit you could eat it away
until flush with the original bolt, THEN continue where you left off.
You need a flex extension too. 

When drilling something very hard (like a graded bolt) do not make
these common errors:
- Too fast drill speed
- Too small drill bit, or bit chucked out too far
- Dull drill bit
- Shallow grind drill bit
- Cheap drill bit (made in China)
I've found that lubrication can be counterproductive. Seems to impede
chip removal. I often have better success with extremely slow drill
speed and a dry bit.

I recently drilled several holes in a 3/8" thick cast automobile frame
with an uncoated HSS bit. Took half hour or so per hole (told you my
drill speed was slow!) but the bit survived the experience as sharp as
it began.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "Michael Paine" <mpaine@xxxx> wrote:
> Hey all,
> 
> Problem: Broken Bolt
> Location: Outer Edge, Corner of Passenger Head (near jump lead post).
> Condition: Not too bad, Exposed 3/8" of bolt.
> 
> <insert all advised ways to extract a broken bolt>
> 
> Extended Problem: Broken bit in broken bolt
> Condition: VERY bad!
> 
> Yes, I was a bonehead in dealing with a broken bolt and have broken a 
> bit INSIDE the broken bolt.
> 
> I REALLY do not want to remove the head, What can I do? The bolt is 
> snapped off about 1/8" below the surface of the head. Using a small 
> mirror I can see it is tightened down to within about 1/8" from the end 
> of the hole. I would wager there is about 1/4" of material to get 
> through. There is no exposed part of the broken bit or the broken bolt. 
> I can't drill as the bit is in the way, I can't grind as I have found 
> nothing small enough to get in there.
> 
> Mayday!
> 
> Michael
> vin 6067




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